"Art is what people are willing to pay for, and an apartment like this is like a piece of art," Klar told The New York Times. Klar has lived in the apartment for 17 years, and says he is moving partially because he's afraid his young son may fall off the terraces, which have 360-degree views.

Klar purchased the apartment in 1993 for $4.5 million as "raw space." It now spans three floors, and includes a separate guest apartment one floor below.

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Juan Pablo Molyneux, a member of Architectural Digest's AD100, designed the apartment.